first of all welcome and congrats on your new amazon! Since its only been 2 days, she is still probably very nervous: new people and a new environment can really stress her out. before handling her, i would work on just getting familiar with her. sit near her cage and talk to her for a little while every day, drop a treat in her dish whenever you walk by, and feed her lots of fresh vegetables and some fruit. now would be a good time to start clicker training her.
Clicker training is great because you can train her to be more comfortable with you and create a positive activity for the two of you without having to get to close. take a dog clicker (you can get them at petco for about 2 dollars) and sit next to her cage. click the clicker and give her a treat through the bars. if she doesn't want to come close enough to take the treat from you, you can use a sprig of millet spray so she can get a treat without coming too close to you. every time you click the clicker give her a treat, you want her to associate the clicking sound with doing something good and receiving a treat. now take a plain chopstick and stick it through the bars of the cage. if she touches it with her beak, or lightly nibbles it, but not bites it (you don't want to teach her to bite the stick) click the clicker and give her a treat. keep doing this in the same spot until she readily reaches for the chop stick. now start to move the stick a few inches over and click and reward her for touching it. keep moving the stick farther and farther away until she will follow the stick all the way across the cage and wherever you point the stick. be sure to reward her every time she touches and follows the stick. Finally, try getting her to come in and out of the cage using the stick to point her in the direction you want. with more time and training you can use the stick to ask her to step up and down, go in and out of her cage, and come to you. Do all of these steps over the period of a few days, keep training sessions short- 15 minute sessions about 3 to 4 times a day.
I would also look into trick training her. Training your bird tricks is a good way to bond with your bird and keep her mentally and physically stimulated. You can also cue a trick when she gets overly excited as a way to distract her. Tricks can also be a great way to introduce her to new people by letting them try to cue a trick and giving her the chance to show off and get comfortable in front of new people. There are plenty of tricks you can teach her with a clicker and without touching her so she can still learn even if you cant pick her up yet.
some birds behave strangely when they are on the floor, so i wouldn't allow her there anymore. my bird starts displaying when let him on the floor. he usually doesn't bite, but he acts like he will. He starts puffing up and pinning his eyes and doing a little swaying dance, its funny to watch but he can get a little too excited and start nipping, so i try to avoid it.
When she bites look her right in the eye and sternly say "no." and put her down somewhere. Not the floor (some parrots react strangely to the floor), and not in her cage. The cage should be a place of rest, play, and enjoyment for your bird, not a place of punishment. try putting her down on a play stand or on top of her cage, but not locked inside. Don't yell at her or yell out in pain. Yelling at her is not good for bonding, and yelling in pain only makes it exciting for your bird. Parrots, especially amazons, love drama so running away while she chases you or yelling out in pain just makes things exciting for them and doesn't teach them not to bite. if you cant pick her up , try using a perch for her to step up on instead of your hand.
I'm sure she has found a great new home with you! Best of luck and God bless~